Definition of radioactive adjective from the Oxford Advanced American Dictionary

 

radioactive

 adjective
adjective
NAmE//ˌreɪdioʊˈæktɪv//
 
 
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sending out harmful radiation caused when the nuclei (= central part) of atoms are broken up
radioactivity
 
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NAmE//ˌreɪdioʊækˈtɪvət̮i//
 
noun [uncountable] the study of radioactivity a rise in the level of radioactivity
See the Oxford Advanced Learner's Dictionary entry: radioactive